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1. Overview

1.1 About this HOWTO

This document describes how to use the PAD built by RAD. We use the APD-2 in a special configuration for the Austrian Federal Railways ÖBB. The ÖBB X25 protocol is described in the "ÖBB X25 Pflichtenheft". This protocol specifies the Layer 4 to 7 for vital and not-vital comunication between railway-station equipment (e. q. interlocking, etc.). The ÖBB X25 protocol specification uses the CCITT X.25 / X.21 communication and uses PVC 1 for channel A and PVC 2 for channel B transmission.

The two-channel transmission in channel A and channel B is used for raising the safety of the connection. In channel B the data is transmitted inverted. For more details cunsult the "ÖBB X25 Pflichtenheft".

Special thanks to Ing. Johann Berger <j.berger@online.edvg.co.at> for the help on getting the first APD-2 and a complete X.25 testconfiguration with Datus-PADs and X.25 Modems (Nokia SB64 and Siemens DAG64 types).

For details to the ÖBB X25 specification you should contact Johann Berger.

Thanks to Michael Smutka <michael.smutka@teleweb.at> for his ideas and reviewing this document and the code.

If you have any suggestions to this document, than feel free to contact me:

Have a lot of fun with this easy to use, easy to configure and very small X.25 PAD APD-2 from RAD.

1.2 Test configuration

For testing the configuration in this document I used the following testequipment:

            +-------+ +-------+
            |       |-|       |
 ch. A -----|       |V|MIC-24T|     +-----+
            | APD-2 |2| /21C  |-----|Modem|~~~~~~~~~~~~~~~+
 ch. B -----|       |4|       |     +-----+               |
            |       |-|       |                           |
            +-------+ +-------+               2-wire      |
                                              longdistance|
            +-------------+                   connection  |
            |             |                               |
 ch. A -----|             |         +-----+               |
            | Datus-PAD   |---------|Modem|~~~~~~~~~~~~~~~+
 ch. B -----|             |         +-----+
            |             |
            +-------------+

       APD-2 ........ PAD with two V.24(8pin-RJ45)/X.28 connectors
                      and one V.24(25pin-SUB-D)/X.25 connector
                      manufactored: RAD
       MIC-24T/21C .. Converter V.24(25pin-SUB-D) to
                      X.21(15pin-SUB-D) connector
                      manufactored: RAD
       Modem ........ X.21 Modem with 64 kBit/sec
                      e.q.: Nokia SB 64k
                            or
                            Siemens DAG 64
       Datus-PAD .... 5820 with 2 V.24 connectors and 1 X.21
                      connector
     

On channel A and B on both ends of the testconfiguration (Datus-PAD and APD-2) we connected the Testrechner TR application, which you also can find on my homepage. You may use any other applications with V.24 connection with 19.200 baud, no parity, 8 Bit, 1 Stopbit.

1.3 Version History


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